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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea3e9c6079d70b9aa47787b3542b80365873d9c02df3760125a758722248d00' 
  AND token = '/dXA9qe3jxSqQlB+wGoURr7si/hA7qag4uws1gpl7GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}